Flight Speed Calculator

Average speed from distance and time, plus the Mach number at a given altitude (ISA).

Calculations run locally in your browser; nothing is sent to a server.

Formula and method

Speed = distance ÷ time. Mach = TAS ÷ a, a = √(1.4·287.053·T), T = 288.15 − 0.0065·h (K, up to 11 km).

900 km/h at 35,000 ft ≈ Mach 0.84.